Stripe-nosed Halfbeaks. The name halfbeak derives from the fact that the lower jaw is long and spear-like, and the upper jaw somewhat shorter, an arrangement that allows these fish to easily feed on floating debris, especially fallen insects.

There is a distinctive black line running along the center of the upper jaw, and a pale spot on the tip of the lower jaw that seems to glow in the water, reminiscent of a fluorescent, yellowish-green, felt-tipped marker. This spot may be effective in attracting insects, their main source of food.